phy: qcom-qusb2: get optional clock by devm_clk_get_optional()

Use devm_clk_get_optional() to get optional clock

Cc: Andy Gross <[email protected]>
Cc: David Brown <[email protected]>
Cc: Vivek Gautam <[email protected]>
Signed-off-by: Chunfeng Yun <[email protected]>
Signed-off-by: Kishon Vijay Abraham I <[email protected]>

Author: Chunfeng Yun

drivers/phy/qualcomm/phy-qcom-qusb2.c

@@ -822,14 +822,9 @@ static int qusb2_phy_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	qphy->iface_clk = devm_clk_get(dev, "iface");
-	if (IS_ERR(qphy->iface_clk)) {
-		ret = PTR_ERR(qphy->iface_clk);
-		if (ret == -EPROBE_DEFER)
-			return ret;
-		qphy->iface_clk = NULL;
-		dev_dbg(dev, "failed to get iface clk, %d\n", ret);
-	}
+	qphy->iface_clk = devm_clk_get_optional(dev, "iface");
+	if (IS_ERR(qphy->iface_clk))
+		return PTR_ERR(qphy->iface_clk);
 
 	qphy->phy_reset = devm_reset_control_get_by_index(&pdev->dev, 0);
 	if (IS_ERR(qphy->phy_reset)) {